io_uring/bpf_filter: mark source as COW when cloning filters

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io_bpf_filter_clone() shares the filter table between source and
destination and marks the destination as needing a copy before it can be
modified, but leaves the source as is. Registering another filter on the
source then modifies the shared table in place, and the change shows up
in everything that cloned it.

Mark the source as COW as well.

Fixes: ed82f35b92 ("io_uring: allow registration of per-task restrictions")
Assisted-by: LLM
Signed-off-by: Hui Peng <benquike@gmail.com>
Link: https://patch.msgid.link/20260919112523.3872581-1-benquike@gmail.com
[axboe: edited patch and commit message]
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Hui Peng 2026-09-19 11:25:23 +00:00 • committed by Jens Axboe

parent 47ccc3f1c6

commit 50b617ba78

1 changed files with 1 additions and 0 deletions

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io_uring/bpf_filter.c

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